'I Dream of Jeannie' Ponytails Sweep the AMAs Red Carpet

The singer arrived at Microsoft Theater on Sunday night wearing a vintage lace bustier and white Alexander McQueen trousers, along with her signature updo (which featured a couple of small braids for added flourish).

The I Dream of Jeannie-esque style seems to have sparked a movement, as both Bailee Madison - who rocked a glittering deep-v gown - and Karlie Kloss - in an Atelier Versace couture ensemble - took the ponytail for a spin, too.